I opened up my imac and tested to make sure power supply is ok, and everything seem to be ok.
But, when I turned on power on, screen is ok but hard drive and dvd rom is not detecting and I don't hear any motor sound from hard drive.
So, I replaced the new hard drive but same issue.
Do you guys know why?
iMac, Mac OS X (10.5.4), iMac G4 20"
You probably need a new PRAM battery. That might fix the optical drive, believe it or not.
Hi, thank you for your help.
However, I changed the PRAM battery, but still not working.
Try an SMU reset:
Resetting the SMU on a G5 iMac:
http://support.apple.com/kb/HT1767
and on resetting the PMU on a Power Mac G5, G4 and G3 :
http://support.apple.com/kb/HT1939?viewlocale=en_US
Might as well try these resets if the above reset does not work.
S
ometimes if volumes don't appear in Startup Manager (what you get when you hold down the Option key at startup), you need to reset the Mac's PRAM, NVRAM, and Open Firmware. Shut down the Mac, then power it up, and before the screen lights up, quickly hold down the Command, Option, P, and R keys, until the Mac has chimed twice more after the powerup chime.
Then, before the screen lights up, hold down Command-Option-O-F until the Open Firmware screen appears. Then enter these lines, pressing Return after each one:
reset-nvram
set-defaults
reset-all
"The reset-all command should restart your Mac. If so, you have successfully reset the Open Firmware settings."
http://support.apple.com/kb/TS1812?viewlocale=en_US
Should the fail...
Try taking the battery out for 10 minutes. Put battery back in. Cross fingers. Power the machine back on.
How to eject a cd from the internal cd drive:
eject cd
List of devices:
devalias
List of variables:
printenv
More than you ever wanted to know about open firmware
Imac G4 20" Power, Display on but, hdd and DVD not detecting
